In order to read off the partial wave coefficients, we will use a similar argument to the one used while extracting the leading Regge coefficients for the Veneziano amplitude [1]}. Firstly, we note that the \(h\) -expansion of \(G_k(h)\)  can be represented in the following form using equations (REF ), (REF ) and the expansion of \(g_{k,r}(h)\)  in \(h\) :
\(\underbrace{\sum _{j=0}^{k}[...]\,h^{-j-1}}_{G_k(h)}=\sum _{r=0}^{k}[...]\,\underbrace{\sum _{p=0}^{r}[...]\,h^{-p-1}}_{g_{k,r}(h)}.\) 
